Special welding wire for automatic welding of main steam pipeline in nuclear power plant

Abstract

The invention discloses a special welding wire for automatically welding a main steam pipe in a nuclear power station. The welding wire comprises the following chemical components: 0.05 to 0.1 wt% of C, 0.7 to 1.0 wt% of Si, 1 to 1.5 wt% of Mn, less than or equal to 0.02 wt% of P, less than or equal to 0.02 wt% of S, less than or equal to 0.15 wt% of Ni, 1.00 to 1.50 wt% of Cr, less than or equal to 0.15 wt% of Mo, and less than or equal to 0.4 wt% of Cu. Compared with the prior art, the chemical compositions of the deposited metal of special welding wire for automatically welding a main steam pipe in a nuclear power station are similar to those of SA335 P11 main steam pipe, the mechanical properties of the welding wire are better than or equal to a present CHW-40CNH welding wire, the anti-FAC performance of a weld joint of an SA335 P11 main steam pipe welded by the welding wire is greatly raised, the quality of the weld joint of the main steam pipe in the nuclear power station can be ensured during operation, so the weld wire is significant for safety operation of a nuclear power unit.

Description

technical field [0001] The invention relates to a special welding material for automatic welding of a main steam pipeline of a nuclear power plant, in particular to a special welding wire capable of significantly reducing the corrosion rate of FAC. Background technique [0002] The temperature of the medium in the main steam delivery pipe of the secondary circuit of the nuclear island of the nuclear power plant is high, the flow velocity is fast, and the flow rate is large (about 1.7 to 1.9 times that of thermal power), which will cause "fluid accelerated corrosion ( FAC)" phenomenon, that is, the inner surface of carbon steel pipe is washed by a large amount of high-speed flowing steam, and the protective oxide film on the inner wall falls off and becomes thinner, which makes the steel matrix worse and the annual corrosion rate increases. When the fluid accelerated corrosion phenomenon is serious, it may cause a pipe burst accident, so it is necessary to improve the anti-st...

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Problems solved by technology

In the actual welding construction, it is also found that when using CHW-40CNH welding wire to weld SA335P11 steel, the fluidity of the molten pool is poor, similar to stainless steel welding wire, which requires a high level of welder operation, which is not conducive to the application of automatic welding technology and the improvement of welding quality

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